Improvement in grate-bars for boiler-furnaces



J. O.'BOBZIEN. v Grate-Bars for Boiler-Furnaces.

Patented Sept-16, 1879-.- V

No. 2i9,679.

N-PEIERS, PHOT O-LITNQGRAFMER, wAsmNGT UNITED STATEs PATENT OFFICE;

JOHN C. BOBZIEN, CHICAGO, ILLINOIS.

IMPROVEMENT l N GRATE-BARS FOR BOILER-FURNACES.

Specification forming part of Letters Patent No. 219,679, dated September 16, 1879; appli cation filed May 9, 1879.

To all whom-it may cohcem:

Be it known that I, JoHN G. BOBZIEN, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Grate-Bars for Boiler-Furnaces;

and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification.

This my invention relates to that class of grates which are composed of multitudinous short and narrow bars; and it is my object to so construct such bars that, independent of the length of the grate, the interlapping ends of the bars will interlock in a manner to be self-supporting like an arch, thereby obviatin g the requirement of intermediate transverse supporting-bars, allowing more freedom for expansion and contraction, providing for a more uniform admittance of atmospheric air to the fuel, and obtaining better access to the interstices between the grate-bars for poking.

My invention consists in providing the interlappin g ends of the' several grate-bars with projecting lugs to their sides and with overhanging lips to their extreme ends, in the manner that the end lips of two adjoining bars will hook over and bear upon the said lugs of each other bar, whereby said bars will be locked together so as to sustain themselves longitudinally on-a straight line; also in additional lugs to said bars, by which each will form a step-like bearing for its transversely adjacent bar, so that said bars will be interlocked and self-supporting in every direction, and will form a level surface of great strength with multitudinous air-passages; and, finally, my invention consists in a notch in the bottom edge of the interlapping end of each bar for iron cross-rods or bolts to be placed transversely through said notches, which will hold the grate-bars longitudinally in their relative positions without furnishing a vertical support for the same, these cross-rods connecting two iron side-endplates placed against the side walls of the furnace.

In the drawings, Figure 1 represents a sectional elevation of the grate, composed longitudinally of three rows of bars. Fig. 2 represents a vertical transverse section of the grate through the interlapping ends of the bars.

A and O are the end, and D is the intermc- .diate bar, which form the full-length grate when put together, the ends ac of bars A C, respectively, resting upon the boiler front and bridgewall plates D of a furnace, and are provided with spacing-studs. e e are vertical notches in the center of the interlapping portions of the several bars. f f are wedge-shaped lugs, projecting from one side of each interlapping grate-bar end; and g g are similar lugs projecting from the opposite side of each gratebar end low enough for the bottom face of lug f of the next adjacent bar to bear upon it. h h are overhanging lips, formed to the top of the extreme interlapping ends of each bar, which lips will each bear upon a lug, f, of the other interlappin g next adjoining bar, whereby two mutually-supporting"points are provided for joining longitudinally each pair of gratebars, which, in conjunction, will sustain the said bars on a straight line with each other. These gratebars are downwardlytapering plain cast-iron plates of reduced thickness at their interlocking ends, and the side lugs thereto, which engage with the end lips, h, are made upwardly tapering for insuring a ready discharge of the ashes from the incandescent coal.

I I are two side-end bars for the grate, which project above the face of said grate, and have their upper inward edges chamfered.

These bars have longitudinally-slotted recesses for receiving the heads and nuts of bolts t, which connect both said plates transversely, and are placed through the notches 0 under the bars A B (J to prevent said bars from shifting longitudinally and from disengaging each other, without, however, assisting to support the grate from below, nor interfering with the expansion and contraction of the several bars.

Such a grate is set up by first placing the plates I and bolts 73 in position, and then by commencing from one side and laying the bars lengthwise set by set until in this manner the opposite side of the furnace is reached.

As will be noticed, each bar being held in position and from lifting out by the next adjacent and interlocking bars, and each bar successively assisting to uphold and carry the others, such a grate is of great supporting strength, and yet has more air-spaces with less solid surface and a greater yielding faculty for irregular expansion and contraction than any other grate that to my best knowledge heretofore has been in existence.

The peculiar construction of this grate enables it to be made much lighter than grates of other construction, and therefore it is much cheaper to manufacture. This grate can also be easily set up in afurnace, and is very durable in use, by reason of the whole surface of the grate being subject to the draft of air. The formation of clinkers will in a great measure be prevented, and the combustion will be greatly facilitated, thereby adapting the grate for burning coa1-screenin gs to advantage.

What I claim as new, and desire to secure by Letters Patent, is-

1. A grate without intermediate supportingbars, made in sections, with the grate-bars of one section locked to those of the adjoining section, and made self -supporting, substantially as described and shown.

2. A grate without intermediate supporting bars, made in sections locked together by lugs f and lips h, whereby they are made self-supporting, substantially as described and shown.

3. A grate without intermediate supportingbars, made in sections, the bars of one section being locked to those of the adjoining section,

JOHN C. BOBZIEN.

Witnesses:

EMIL H. FROMMANN, GUS. A. WUNDERLE. 

